It would appear you didn't read, or maybe didn't understand, my comments above. Try again.
Does it matter if a HIV positive man's blood enter my oral sores?
Still no significant risk. Just think about it: in the 30 years of the worldwide HIV epidemic, there must have been billions of kisses between HIV infected and uninfected partners; and oral sores and bleeding are sufficiently common that there must have been millions of events just like yours. And yet no known cases of HIV acquired by such events. Even the busiest HIV/AIDS clinics never see patients who have not had typical exposure, i.e. unprotected vaginal or anal sex, shared needles, etc. Nobody whose only exposure was kissing.
On top of that, you give no reason to suppose your kissing partner had HIV anyway.
Time to stop worrying about it! But if you remain frightened, feel free to have an HIV test in a few weeks.
but his lip is bleeding!
And I have a mouth ulcer!
So his blood has entered my mouth...
absolutely no way. hiv is not transmitted by kissing, never ever.